Car dies when accelerating up around 3500RPM, no power- like key is off.

Asked by Mar 28, 2017 at 07:29 PM about the 2005 Pontiac Grand Prix Base

Question type: Maintenance & Repair

have a 2005 grand prix 3.8L base model. It idles OK. While in park- Rev it up and it stops power at 35K-36K rpm even though there is much more gas pedal. When driving it is OK driving slow 15 rpm-25K rpm, when I accelerate past 35K (55-60mph) it will just die. No power steering. I can wait a minute and it will start back up. I have put in a fuel pump (includes regulator/filter) and cleaned the MAF. These had no help.
Any suggestions?

1 Answer

Ended up taking car to mechanic shop .They found the ECM failing. The Engine Control Module (ECM) can fail causing stalling, and engine and transmission drivability concerns. They re-flashed it and cleaned a ground wire. It has been driving good since. Hope it will keep going, good car for work.

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